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From: C Egernet on 4 Aug 2010 02:45
> Perhaps for his stated purpose -- to learn?

True.

Right now, the main purpose is to learn about these beasts.

> Building quiet switchers used to be real voodoo, but there's a lot of interest in them and hence
> a lot of knowledge floating around out there.

It's the "floating around" bit, I'd like to deal with. That is, where
do I find some of this knowledge.

I suggested application notes myself but unless one has some prior
knowledge each and every one of them seems to be the latest and the
greatest. Some pointers would be helpful.


Chris
From: C Egernet on 4 Aug 2010 02:54
> Why would you want to do that?  A receiver isn't going to draw much
> current, yet to use a switching supply means you have to deal with
> all the noise that such supplies generate, not a good thing when
> building a receiver.

Fair comment.

I suggested this because, (a) I need one, (b) I thought it a not too
extreme goal. A good point about the noise, though.

> The effort in making the power supply as noise free as possible might
> be a useful learning process, if there was an actual need for higher
> current, but it's not.

:-(

Again, even if I, following your advice, should do this particular
project with a linear power supply, learning about switchers is still
interesting.

> As for the rest, define what you want to do.  Do away with transformers?
> Provide regulation without a lot of loss?

Getting rid of heat and heatsinks is definitely a priority. My
question about flyback was motivated by the notion that they include
transformers and provide galvanic isolation.

> The best place to start would seem to be a hybrid, start with a 60Hz
> stepdown transformer, rectifiers and a filter capacitor, and then build
> a switching regulator.  Learn from that, don't get lost in extra stages,
> and then later you can go to a full switching supply.

Excellent idea. I have a small (too small for the above project)
potted mains transformer in my junk box that could get me going.


Chris

From: C Egernet on 4 Aug 2010 03:17
> The OP should go and browse ONsemis and Fairchilds site for offline
> controllers for tons of info includeing examples and sources for small
> quantity magnetic's.

Good point about small quantity magnetics.

ONsemi's tutorial page has 24 documents alone! I'll have a look.


Thanks

Chris

From: Jon Kirwan on 4 Aug 2010 04:11
This,

http://www.onsemi.com/pub_link/Collateral/SMPSRM-D.PDF

this,

http://www.jaycar.com.au/images_uploaded/dcdcconv.pdf

this,

http://focus.ti.com/docs/training/catalog/events/event.jhtml?sku=SEM401014

these,

http://focus.ti.com/docs/training/catalog/events/event.jhtml?sku=SEM401001
http://focus.ti.com/docs/training/catalog/events/event.jhtml?sku=SEM405006
http://focus.ti.com/docs/training/catalog/events/event.jhtml?sku=SEM406008
http://focus.ti.com/docs/training/catalog/events/event.jhtml?sku=SEM408003

and this?

http://www.smps.us/Unitrode.html

Jon
From: C Egernet on 4 Aug 2010 07:00
On Aug 4, 10:11 am, Jon Kirwan <j...(a)infinitefactors.org> wrote:
> This,
>
> http://www.onsemi.com/pub_link/Collateral/SMPSRM-D.PDF

Wow, even the first one will keep me occupied for a while.

Thanks, Jon.


Chris
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